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Science 17 January 1992:
Vol. 255. no. 5042, pp. 342 - 344
DOI: 10.1126/science.255.5042.342
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Articles

Quantum Conversion and Image Detection by a Bacteriorhodopsin-Based Artificial Photoreceptor

TSUTOMU MIYASAKA 1, KOICHI KOYAMA 1, and ISAMU ITOH 1

1 Ashigara Research Laboratories, Fuji Photo Film Company, Limited, Minamiashigara, Kanagawa 250-01, Japan

A thin film (50 to 500 angstroms thick) comprising fragments of bacteriorhodopsin (bR)-containing purple membrane was formed on an SnO2 conductive electrode by the Langmuir-Blodgett method. The film was put into contact with a thin, aqueous electrolyte gel to construct an electrochemical sandwich-type photocell with a junction structure SnO2/bR/electrolyte/Au electrode. Under visible light irradiation, the bR-based photocell produced an efficient rectified photocurrent that proved to have unique differential responsivity to light intensity, which is characteristic of in vivo biological photoreceptors. An artificial photoreceptor comprising a pixel network of the bR photocell was fabricated in an attempt to study image-detecting and processing abilities of bR.

Submitted on August 28, 1991
Accepted on November 15, 1991


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